Effect of lightweight aggregates on the mechanical properties and brittleness of lightweight aggregate concrete

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • H. Z. Cui
  • Tommy Yiu Lo
  • Shazim Ali Memon
  • Weiting Xu


Original languageEnglish
Pages (from-to)149-158
Journal / PublicationConstruction and Building Materials
Publication statusPublished - Oct 2012


The influence of volume fraction and aggregate properties on the mechanical performance of lightweight aggregate concrete (LWAC) were studied. A new Shape Index that described the shape characteristics of lightweight aggregate (LWA) has been proposed and its effects on resulting LWAC were evaluated. Test results substantiate that the proposed Shape Index had a great influence on the mechanical properties of LWAC. Crack development, failure characteristics and stress strain curves of LWAC were studied and the concept of the proportional strain ratio was introduced to evaluate the brittleness of LWAC. Test results showed that higher volume content of LWA resulted in a more brittle failure. It was also found out that for similar concrete strengths, LWAC was comparatively brittle than normal weight concrete (NWC). © 2012 Elsevier Ltd. All rights reserved.

Research Area(s)

  • Compressive strength, Lightweight aggregate concrete, Proportional strain ratio, Shape Index, Young's modulus